Triggering a buffer status report
Apparatuses, methods, and systems are disclosed for triggering a buffer status report. One method ( 700 ) includes determining ( 702 ) to transmit a buffer status report corresponding to uplink data in response to a trigger condition. The method ( 700 ) includes, in response to determining to transmit the buffer status report, transmitting ( 704 ) the buffer status report to a parent integrated access backhaul device.
1. A method comprising:
determining to transmit a buffer status report corresponding to uplink data in response to a trigger condition, wherein the trigger condition comprises determining that new uplink data is available for a predetermined number of bearers that belong to a logical channel group prior to expiration of a timer, the predetermined number of bearers has a priority higher than other bearers having available uplink data that belong to any logical channel group, and the predetermined number of bearers is configured by radio resource control signaling,
in response to the expiration of the timer and the trigger condition not occurring, setting the predetermined number of bearers equal to zero; and
in response to determining to transmit the buffer status report, transmitting the buffer status report to a parent integrated access backhaul device.
2. The method of claim 1 , further comprising receiving the uplink data at a remote unit or an integrated access backhaul device.
3. The method of claim 1 , wherein transmitting the buffer status report comprises transmitting the buffer status report in response to multiple remote unit bearers being multiplexed into one logical channel.
4. The method of claim 1 , wherein the trigger condition comprises a first content of a current buffer occupancy differing from a second content of a previous buffer occupancy.
5. The method of claim 4 , wherein the trigger condition comprises the first content being different from the second content by a predetermined percentage range.
6. The method of claim 5 , wherein the predetermined percentage range is indicated by an index value corresponding to the predetermined percentage range.
7. The method of claim 4 , wherein the current buffer occupancy and the previous buffer occupancy are associated with at least one logical channel group.
8. The method of claim 4 , wherein the parent integrated access backhaul device determines that the first content and the second content are the same in response to not receiving the buffer status report.
9. The method of claim 1 , wherein the trigger condition comprises a buffer occupancy exceeding a predetermined threshold.
10. The method of claim 9 , wherein:
the predetermined threshold is configured by radio resource control signaling;
the buffer occupancy is associated with at least one logical channel group;
the parent integrated access backhaul device determines that the buffer occupancy is less than the predetermined threshold in response to not receiving the buffer status report; or
some combination thereof.
11. The method of claim 1 , wherein the trigger condition comprises determining that new uplink data is available for a bearer that belongs to a logical channel group, and the bearer has a priority higher than other bearers having available uplink data that belong to any logical channel group.
12. The method of claim 1 , wherein the trigger condition comprises determining that new uplink data is available for a bearer that belongs to a logical channel group, and other bearers that belong to any logical channel group do not have available uplink data.
13. The method of claim 1 , wherein the timer is started in response to transmitting a prior buffer status report, the timer is configured by radio resource control signaling, or a combination thereof.
14. The method of claim 1 , wherein the timer is started in response to transmitting a prior buffer status report, the timer is configured by radio resource control signaling, or a combination thereof.
15. The method of claim 1 , wherein the trigger condition comprises a buffer occupancy exceeding a predetermined threshold, and the buffer occupancy is for one logical channel group or all logical channel groups.
16. An apparatus comprising:
a processor that:
determines to transmit a buffer status report corresponding to uplink data in response to a trigger condition, wherein the trigger condition comprises determining that new uplink data is available for a predetermined number of bearers that belong to a logical channel group prior to expiration of a timer, the predetermined number of bearers has a priority higher than other bearers having available uplink data that belong to any logical channel group, and the predetermined number of bearers is configured by radio resource control signaling; and
in response to the expiration of the timer and the trigger condition not occurring, sets the predetermined number of bearers equal to zero; and
a transmitter that, in response to determine to transmit the buffer status report, transmits the buffer status report to a parent integrated access backhaul device.